KONKA KL26AS21Q Schematic

LCD TV SERVICE MANUAL

Modle list

KL26AS21Q，KL26AS23Q，KL26AS25Q
KL27BS23Q，KL32AS21Q，KL32AS22Q

KL32BS23Q，KL32AS25Q，KL32BS28Q

KL37BS21Q，KL37AS22Q，KL37AS23Q

KL40BS21Q，KL42AS23Q

KONKA GROUP CO,LTD.

Digital Flat Display Division

IMPORTANT SERVICE SAFETY INFORMATION

Operating the receiver outside of its cabinet or with its back removed involves a shock hazard. Work on these
models should only be performed by those who are thoroughly familiar with precautions necessary when working on
high voltage equipment.

Exercise care when servicing this chassis with power applied. if carelessly contacted, can cause serious shock or
result in damage to the chassis. Maintain interconnecting ground lead connections between chassis, escutcheon, picture
tube dag and tuner when operating chassis.

When it is necessary to make measurements or tests with AC power applied to the receiver chassis, an Isolation
Transformer must be used as a safety precaution and to prevent possible damage to transistors. The Isolation
Transformer should be connected between the TV line cord plug and the AC power outlet.

It is important to maintain specified values of all components and anywhere else in the received that could cause
a rise in operating supply voltages. No changes should be made to the original design of the receiver.

Components shown in the shaded areas on the schematic diagram and/or identified by in the replacement parts
list should be replaced only with exact factory recommended replacement parts. The use of unauthorized substitute
parts man creates may create shock, fire, or other hazards.

Before returning the receiver to the user, perform the following safety checks:

1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis

and other metal parts in the receiver.

2. Replace all protective devices such as non-metallic control knobs, insulating fish papers, cabinet backs, adjustment

and compartment covers of shields, isolation resistor-capacitor networks, mechanical insulators etc.

3. To be sure that not shock hazard exists, a check for the presence of leakage current should be made at each exposed

metal part having a return path to the chassis (antenna, cabinet metal, screw heads knobs and/or shafts, escutcheon,
etc.) in the following manner.

Plug the AC line cord directly into a 110V/220V/240V, AC receptacle. (Do not use an Isolation Transformer
during these checks.) All checks must be repeated with the AC line cord plug connection reversed. (If necessary, a
non-polarized adapter plug must be used only for the purpose of completing these checks.)

PLEASE READ BEFORE ATTEMPTING SERVICE

1. Use an Isolation Transformer when performing any service on this chassis.

2. Never disconnect any leads while receiver is in operation.

3. Disconnect all power before attempting any repairs.

4. Do not short any position of the circuit while the power is on.

5. For safety reasons, replace components any with identical replacement parts (SEE PARTS LIST).

6. Before alignment, warm up the TV for at least 30 minutes.

7. When removing a PCB or related component, after unfastening or changing a wire, be sure to put the

wire back in its original position.

8. Inferior silicon grease can damage IC's and transistors. When replacing IC's and transistors, use only

specified silicon grease. Remove all old silicon when applying new silicon.

9. Before removing the anode cap, discharge eletricity because it contains high voltage.

A. SPECIFICATION

System : PAL I D/K B/G, SECAM D/K B/G L/L’

Channel :

VHF~ Low BAND ： 0 CH（46.25MHz） ~ S9 CH（161.25MHz）
VHF~ High BAND ： S10 CH（168.25MHz）~ S41 CH（463.25MHz）
UHF BAND ： E21CH（471.25MHz）~ E69 CH（855.25MHz）

Antenna Impedance : 75Ω(Unbalance)

Audio Output Power :

Size 26/27 32 37 40 42

Power(W) 4 W*2 4 W*2 5 W*2 5 W*2 5 W*2

Power Supply : ~110－240V, 50/60Hz

Power Consumption :

Size 26/27 32 37 40 42

Power

Consumption(W)

160

Item Port List

1 RF Cable
2 SCART RGB & Composite
3 SCART Y/C & Composite
4 PC VGA Input
5 Video Input
6 HDMI Input
7 Y、Pb/Cb、Pr/Cr Input
8 Earphone Audio Output
9 Audio Input

180

195

270

270

ere is abno

.

f

f

B. ADJUSTMENT MANUAL

TEST NOTE

1. Please follow the pointed test steps and choose the right test equipment to conduct
adjustment, otherwise good effect of Unit could not be obtained. The unit should be warmed
up for 30 minutes before adjustment and every parameter should be adjusted repeatedly till the
optimum value obtained, the pointed voltage value should be ensured during test to get
satisfied test result.

2. Test environment

1) Temperature 15°C～35°C

2) Relative Humidity 45%～75%

3) Air pressure 86KPa～106KPa

3 . Test equipments（The following equipment should be calibrated before testing）

1) Computer 1 set

2) Multi-meter (VICTOR VC9801) 1 set

3) VideoSignalGenerator (ChromaModel2227/2327/VG859/SFU)

4) Color Analyzer (Chroma Model 7120 )

5) DDC card (DYNACOLOR, INC D8330)

6) TV Video Signal Generator (FLUKE PM54200) 1 set

7) Remote controller with factory keys 1 set

8) AV,VGA, YPbPR/YCbCr,HDMI Signal line etc 1 set

4 . Test item and method

1 set

1 set
1 slice

Program Menu Equipments Requirements Procedure and SPEC

1

confirmation

2

3

NVRAM

EEPROM

M/B

Voltage

Update

Update

HDMI

Digital

Multimeter

PC

Debug T ool

PC,ALL-11

Debug T ool、

HDMI Cable

JSK3178-006

Min Board

1. Connect Power to check if Power
LED displays the green light.

2. Please refer to appendix 5.1/5.2/5.3
if th

1. Please refer to appendix 5.6 i
there is abnormal phenomenon.

1. Please refer to appendix 5.6 i
there is abnormal phenomenon.

rmal phenomenon

HDCP KEY

f

b

j

4

Update

PC,ALL-11
Debug T ool

1. Please refer to appendix 5.6 i
there is abnormal phenomenon.

Enter factory

5

6

7

8

NVRAM

enactment

（default）

Auto color

menu

Update

explain

factory

1. Enter factory menu，Select “VGA

1.Enter factory menu, Select

TV Signal

Generator

（FLUKE

PM54200

PM5418）

AV ： interlaced
output
PAL and NTSC
Mode, black and
white signal；
YPbPr：interlaced
output COLOR
signal；
VGA：interlaced
output COLOR
signal。

1. Enter factory menu : Press MENU

utton on the remote control, then

Press PRE button per 5 times。

IIC SELECT”
IIC： From VGA Update UOCIII
NVRAM
TXRX：From VGA Update MCU
NVRAM；
DDC: From VGA Update
DDCNVRAM；

“RESET”, turn off the power , after
be over then supply the power again。

1.Enter factory menu, Select “Auto
color”,（NOT：after 10 seconds，
factory appear “PASS”Auto color
adjustment OK； appear “FAIL”
Auto color adjustment be defeated，
then again adjustment。）

Color Temp.
adjust

9

white-balanc
e calibrate

a.AV :Color
Temp and
white-balanc
e calibrate
adjust

b.YPbPr:
Color Temp
and
white-balanc
e calibrate

ust

ad

1After Color Temp adjustment OK，
Can’t” Auto Color” again。

TV Signal

Generator

Color Signal

Generator

HDTV Video

Signal Generator

VG848

Color Signal

Generator

Enter black and
white signal

Enter black and
white signal

1.Enter factory menu, Select “USER
RGB”,
Adjustment B-R/G/B, chromaticity
coordinates of white to fit the12000
Adjustment C-R/G/B, if black
calibration.

1.Enter factory menu, Select “USER
RGB”,
Adjustment B-R/G/B, chromaticity
coordinates of white to fit the12000
Adjustment C-R/G/B, if black
calibration.

c.VGA Color

yer

p

r

Temp and
white-balanc
e calibrate
adjust

HDTV Video

Signal Generator

VG848

Color Signal

Generator

Enter black and

white signal,

Enter User menu,

Select “Color

Temp.

1. .Enter factory menu, Select “Color
Temp”, Select”7500”, chromaticity
coordinates of white to fit the7500;
Select”Memory” chromaticity
coordinates of white to fit the12000.

10

a.AFC

11

12.

TV
parameter
enactment

Setup

b.AGC

adjust

DDC

function

examination

TV mode

check

TV Signal

Generator

TV Signal

Generator

PC or Pattern

Generator

Factory TV

Signal or TV

Signal Generator

1. Enter User menu ， Select
“CHANNEL”，Setup AFC for “ON”

TV Enter

60dB-90dB “half

Color

BAR”、”GREY”

Picture

1024*768@75Hz

；Picture

Output PAL

Signal

1. Press button to display factory
menu on TV and select “RF AGC”,
press volume +/- button to adjust 。

2. pledge 60dB to 90dB Screen is
clear and fluent。

1. DDC Tester connects with the
platform then read or writes data in
EEPROM.

2. Affirm DDC2 content is right or
not.

1.Enter User menu, Check if the
pictures normal, no Signal
background the snowflake points are
come forth ， no Signal is would
several minutes enter standby state.

2. Check Auto Search/Management、
etc is right or not.

13.

14

15

16

VIDEO

check

SCART

check

SCART

output check

Y,Cb,Cr(480

I/576I)

DVD

Video Cable

FLUKE54200

Input TV Signal

or input CVBS

Signal

DVD

Component Cable

720p/1080i DVD

Pla

Play DVD

Set DVD to

interlaced output

SCART output

R.G.B、Y/C and

CVBS Signal

SCART output

TV Signal or

CVBS Signal to

else one TV

Play DVD

Set DVD to

interlaced

ut（Y,Cb,C

out

1.Screen is clear and fluent, Audio
checks if the output is normal。

1Screen is clear and fluent, Audio
checks if the output is normal。

2.check SCART output RGB.Y/C and
CVBS，can automatic switch Screen
is clear and fluent.

1.Screen is clear and fluent, Audio
checks if the output is normal。

1.Screen is clear and fluent, Audio
checks if the output is normal。

）